Improvement in gauge-rocs



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E LIzS. PRI-ME,` OF ,BALTMORBL MARYLAND` Letters Patent No. 101,309, dated March' 29, 1870.

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IMPROVEMENT IN GAUGE-RODS.

The Schedule referredl to in these Letters Patent and making part o-the same.

To alt whom it may concern Be it known that I,'ELI S. PRIME, of the city and county of Baltimore, and State of Maryland, have invented a new and Improved Gauging'nstrument; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings making a`part of this specification, inwhich'- Figure 1 isa perspective view 'of rod and slides. Figure 2, transverse section inline :c az, iig. l. Figure 3, transverse section in line y y, g. 1. This invention consists in the combination of a gauge-rod, a variety f-scale, and a bung-slide, in such a manner as to enable the operator to accurately ascertain the contents of a cask withoutperforming any mental computation.

The under or variety sca1e O is about fteen inches in. length, having a band, c, at each end, the lower band made to-t the -rod D just .loose enough to allow the slide to work-on the rod with ease. The upper band isv suiiciently large` to admit a spring to keep it in proper position.

j `This scale O is laid ol in two-divisions,l designated, respectively, A and B, and has, also, numerous llinescut across the face, at-a distance of one-tenth of an inch apart, which workin exact vharmony with similar lines on the rod. l

On the face of this slide is arranged what-is known to gangers as the first, second, or third variety-scale, (the drawing shows the calculations for the second variety,) with'the numerals cut in figures instead or" the usual marks. A

The over 7 or bung-slide E is similar to the slide now in common use, and is made large enough to work overthe scale-slide without danger of moving it from any given pointat which itmay be set on the rod.

The instrument is worked as follows: v

The point of the 4rod D is placed -on the outside of the head and against'the projecting end of the staves, diametrically across. The Alower end of the scale-slide C is set at the greatest diameterl of the head.

The rod is then inserted in lthe*loarrehand the bung-diameter is obtained by drawing theover-slide E up until the jut c strikes the under side of the vbung-stave at itsgreatest distance from the bottom of the barrel.

The rod is then drawnfrom the barrel, and at the lower end of the over-slide E, on the A side of the scaleG, will be found the difference between the head and bung. On the B yside will be found the proper amount to add to the head for the mean diameter.

We then look for this number on A, just opposite which number, on D,will be found registered the `mean diameter of the barrel.

Multiply the difference, 4,8 by .64, which gives for mean; 3.0 Addthe head.. 18.6

Mean diameterA of barrel 21.6

We set the bottom. of the scale-slide C at eighteen and six-tenths on the rod D', and the bottom of the over-slide E at twenty-three and four-tenths on D, when, at the bottom lofover-slide on A, will be found four and eight-tenths, and on same line on B will be found three. We then look for three on A, when just opposite, on D, will be found twenty-one and sixtenths, the mean diameter, in figures and fractional marks.

The great advantage of this scale will be readily seen and appreciated by all who have gaugedby the Caliper system, from the fact'that-it supersedes the necessity of putting the dimensions of the .headv and bung down on the barrel in chalk or pencil-marks, and, further,it does away with all mental calculations` in gauging.

All experienced gangers know that the point at which most errors occur in gauging is in finding the mean diameter by mental calculations.` This instrument avoids all possibility of error in this respect by showing- First, the head diameter;

Second, the bung-diameter; I

Third, the difference between head and bung diameters' Foiirth', theamount to be added to the head; and

' Fifth, it adds this .difference to the head, andshows the mean diameter in. plain figures, a resultvwhich is not obtained by any other instrument within my knowledge. v u u The rod D is provided with .two scales showing inches and fractional parts of inches, which scales are on adjacent sides of the rod instead of being on opposite sidesas heretofore.

The reason of this change is that the operator may find thehead-diameter on-the rst scale of D by the use of the slide G, and maythen find the bung-diameter on the second scale of vD by the use of the slide E without changing the position of the former slide, i Wim; I claim as new and desire to secure by Letand. that. the tenths of inches on the second scale of i ters Patent, is-

1) may correspond with the enths of inches on the il The combination, slide C, and enable the slide E, resting on the ascertained mark of the second scale of D, to indicate the proper figures on the slide C, and also enable `the wit-lx :L gauge-rod, of` an under or difference sliding scale, C, and an over or h\1ngslide, E, in the manner and for the purpose specified.

u LI S. PRIME. 'proper ligure of the slide C te indicate the mean dil :mieter on thev second scale of D, all as hereinbeforc Witnesses:

GEO. E. BROWN, CEAS. A; PET'rl'r.

described. I 'Haring thus described my invention,` 

